Three-eighths of the students in the calligraphy interest group are girls, and now there are five more participants. At this time, the number of girls accounted for four-ninth of the total knowledge. How many people are there in the calligraphy class now?
There will be a list of equations, but I don't know what grade the questioner is in.
Let the original number of people be x
3/8 X+5= 4/9 (x+5)
X=40
So now the number is 45.
(but I don't know what's the difference with other people's calculations. )